div.tree div {
 padding-left:16px;
}
div.tree div.parent div {
 display:none;
 cursor:default;
}
div.tree div.parent {
 cursor:pointer !important;
 background:transparent url("imagesGepeto/plus.gif") no-repeat top left;
}
div.tree div.expanded {
 background:transparent url("imagesGepeto/moins.gif") no-repeat top left;
}